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Senior Materials Engineer (Metallurgy)

Radiant
El Segundo, CA Full Time
POSTED ON 5/4/2026
AVAILABLE BEFORE 6/27/2026
Radiant is seeking a highly motivated Senior Materials Engineer to own testing and qualification of materials and related manufacturing processes (welding, brazing, coatings, etc.) used in the Kaleidos 1MW nuclear microreactor. The ideal candidate takes great ownership of their work end-to-end, is proficient in materials selection, testing, and analysis, and is excited to work in a highly cross-functional, fast-paced environment. You will be a key contributor to building the world's first mass-produced, rapidly-deployable nuclear reactor.

Responsibilities & Duties

  • Plan and execute materials testing to obtain material properties to inform design decisions.
  • Own the qualification of all metallics used in the design for the Kaleidos reactor. Conduct rapid-turnaround prototypic testing to buy down risk for design and integration decisions.
  • Work with manufacturing team to Ddevelop and qualify application-specific manufacturing processes such as welding, brazing, coating, casting, etc.
  • Provide expert guidance in materials selection for components within Kaleidos.
  • Identify, procure, and operate equipment for materials characterization and testing.
  • Evaluate data quality and accuracy of material property data for use in company materials database.
  • Define or improve manufacturing processes of components to achieve desired material properties.

Required Qualifications & Skills

  • Bachelor’s degree from an accredited institution in Materials Science and Engineering, or in Mechanical, Aeronautical, Nuclear, or Chemical Engineering with a materials science and engineering focus.
  • 5 years of experience working in the development, testing, and/or analysis of materials for demanding load cases and environments. Desired Qualifications & Skills
  • Master’s or PhD degree from an accredited institution in Materials Science and Engineering, or in Mechanical, Aeronautical, Nuclear, or Chemical Engineering with a materials science and engineering focus.
  • Experience with development and qualification of welding, brazing, soldering and/or other solidification processes.
  • Experience with development and qualification of metal and non-metal coatings.
  • Knowledge of standard test methods for materials and experience with development of design allowables.
  • Self-motivated with strong organizational, written, and oral communication skills.
  • Demonstrated ability to work collaboratively with design and operations teams to deliver high-value results.
  • Experience with using text-based software development tools (Python or similar).

Additional Requirements:

  • Must be willing to work extended hours and weekends as necessary to accomplish our mission.
  • Must work 100% onsite in El Segundo.

Benefits And Perks

  • Stock: Substantial incentive stock plan for all full-time employees.
  • Medical: 100% up to base silver level plan for employee 50% dependents, offers up to Platinum plans.
  • One Medical: Sponsored memberships for employees and their dependents.
  • Vision: 100% top tier plan coverage 50% for dependents.
  • Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.
  • Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
  • 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.
  • Daily catered lunch. Free snacks and drinks.
  • Flexible PTO policy. Remote workday allocation.
  • Company and team-bonding events, happy hours and in-person camaraderie.
  • Beautiful El Segundo headquarters close to the Pacific Ocean.

Total Compensation And Benefits

Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.

The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com.

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.

Unfortunately, we are unable to provide visa sponsorship at this time.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.

Compensation Range: $133.5K - $207.9K

Salary : $133,500 - $207,900

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